body {
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #282828;
}

.form-signin {
  max-width: 330px;
  padding: 15px;
  margin: 0 auto;
}
.form-signin .form-signin-heading,
.form-signin .checkbox {
  margin-bottom: 10px;
}
.form-signin .checkbox {
  font-weight: normal;
}
.form-signin .form-control {
  position: relative;
  height: auto;
  padding: 10px;
  font-size: 16px;
  margin-top: 5px;
}
.form-signin .form-control-yz {
  height: auto;
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
  padding: 10px;
  font-size: 16px;
    width: 40%;
    line-height: 1.42857143;
    color: #555;
    background-color: #fff;
    background-image: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
    box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
    -webkit-transition: border-color ease-in-out .15s,-webkit-box-shadow ease-in-out .15s;
    -o-transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
    transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
}
.form-signin .imgyz{
  margin-left: 20px;
}
.form-signin .form-control:focus {
  z-index: 2;
}
.form-signin input[type="password"] {
  margin-bottom: 10px;
}
.form-signin h2,label{
  color: slategray;
}
.masthead{
  margin: 100px 0 150px 0 ;
}
.masthead h3{
  color: slategray;
}
.mastfoot{
  margin-top: 100px;
  color: slategray;
  text-align: center;
}